Method for manufacturing lens mold core

Abstract

A method for manufacturing a lens mold core includes the following steps. First, a blade is provided. Then, the blade is driven to a number of cutting points in this order from the peripheral to the center of a molding surface of the lens mold core facing the blade at a fixed pitch less than about 500 nm, according to the manufacturing parameters of the lens mold core. Next, the lens mold core is driven to move toward the blade along a central axis of the molding surface and to spin about the central axis at each cutting point until the blade cuts into the molding surface a desired depth, according to the manufacturing parameters of the lens mold core.

1 . A method for manufacturing a lens mold core, comprising:
 providing a blade;   driving the blade to a plurality of cutting points in this order from the peripheral to the center of a molding surface of the lens mold core facing the blade at a fixed pitch less than about 500 nm, according to the manufacturing parameters of the lens mold core; and   driving the lens mold core to move toward the blade along a central axis of the molding surface and to spin about the central axis at each cutting point until the blade cuts into the molding surface a desired depth, according to the manufacturing parameters of the lens mold core.   
     
     
         2 . The method of  claim 1 , further comprising:
 setting the lens mold core and the blade to respective origins, where the blade points to the molding surface exactly along the central axis; and   restoring the lens mold core and the blade are restored to the respective origins after the cutting is finished at an old cutting point but before the blade is driven to a new cutting point.   
     
     
         3 . The method of  claim 1 , wherein the pitch is set to about 416 nm. 
     
     
         4 . The method of  claim 1 , wherein the pitch is set to about 300 nm. 
     
     
         5 . A method for manufacturing a lens mold core, the lens mold core having a molding surface, the method comprising:
 (a) providing a blade;   (b) driving the blade to point to a cutting point on the molding surface;   (c) driving the lens mold core to move toward the blade along a central axis of the molding surface and to spin about the central axis until the blade cuts into the molding surface a desired depth;   (d) moving the lens mold core back such that the blade moves out of the lens mold core; and   (e) repeating the steps (b), (c) and (d) until a plurality of circular and concentric micro-scaled residues are formed on the molding surface and each residue is positioned between two adjacent cutting points, wherein the blade is driven to point to the cutting points in this order from a peripheral portion to the center of the molding surface at a fixed pitch less than about 500 nm such that the residues cooperatively constitute a diffractive grating having a spatial cycle equal to the fixed pitch.   
     
     
         6 . The method of  claim 5 , wherein in the step (a) the blade points to the molding surface exactly along the central axis. 
     
     
         7 . The method of  claim 5 , wherein the fixed pitch is equal to about 416 nm. 
     
     
         8 . The method of  claim 5 , wherein the fixed pitch is equal to about 300 nm.